Carbureter.



UNITED STATES FATE.

OFFICE.

FRANK A. SHARPNECK, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE \VIZABD MANU- FACTURING COMPANY OF MICHIGAN, OF ST. JOSEPH. MICHIGAN, A CORPORATION OF MICHIQAN.

CARBUBETER.

absence.

Specification of Letters Patent.

Application filed March 17, 1913. Serial No. 754,842.

To aZZachom it may concern Be it known that I, FRANK A. SHARP- NECK, a citizen oil the United States, and a resident of the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Carburetors, of which the following is a specification.

My invention relates to improvements in "carburetors and has for its object the provi-' sion of an improved carburetor which is of simple construction and eihclcnt m operation.

The invention consists in the combinations and arrangements of parts hereinafter dcscrirbed and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in whi-eh-- Figure 1 is a top plan view of a carburetor embodying my invention, Fig. 2, a side elevation of the same,Fig. 3, a section of said carburetor taken on line i1I-Z of Fig. .2, and Fig. 4 a' section taken on line y -g of Fig. 2.

The preferred form of construction as illustrated in the drawings comprises a suit' able float chamber 1 in which is arrangml an ordinary form of annular cork float 53 carried by an operating lever 3 which controls the operation of a valve stem 1 and through said-valve stem the operation of an admission valve 5 which controls the entry of fuel to said float chamber through an. ordinary nipple 6, as will'be readily UINlQlStOOtl by those skilled in the art. Float chamber 1 is provided with a removable cover 7 carrying a centrally arranged hollow stem 8 which projects above and below said cover and through axcentral opening in the bottom of float chamber 1 as shown in F ig. 3. A not 9 is threaded on the lower end of stem 8 and abuts the bottom of chamber 1, a suitable packing being interposed between said nut and the bottom of chamber 1. This arrangement constitutes a simple and effective construction for assembling the parts.

A throttle valve chamber 10 is arranged at the upper end of stem 8, said throttle valve chamber, stem and cover 7 being made integral with each other. A throttle valve 1110f any usual or desired construction is arranged in chamber 10 and is operated by means of a shaft 12 extending through a,

wall of said chamber inthe usual manner. An annular valve seat 13 is arranged in the lower portion of chamber 10 and air openings 14: lead therefrom, as shown. Arranged in chamber 10 is a hollowwalve head 15 adapted to seat upon valve seat 13 and control= the passage ofair theretln'ough, said valve head carrying a depending hollow valve stem 16 which operates in stem 8 and projects below the bottom thereof. The lower end of valve stem 10 carries a threaded adjusting nut 17 which imprisons a spring 18, said spring serving to yieldingly hold valve 15 to its seat. By this arrangement it will be ol'iscrved that as the suction of the engine increases on high speeds, valve 15 will be raised from its scat proportionately to the increase of such suction and said speed of the engine, thus permitting the introduction of a proportionately greater amount of air to valve chamber 10 and thence to the engine.

substantially U-shaped fuel supply pipe 19 leads from the bottom of float chamber- 1 upwardly into valve stem 1b, the upper terminal Q0 of said tube being arranged slightly above the normal fuel level in float chamber 1. A tortuous passage 21 is arranged in the bottom of chamber 1 to permit the passage of fuel to pipe 19, as shown in Fig. 3, said passage being controlled by a needle valve 22 whichis threaded in float chamber 1 and is provided with a stuffing box 23 to prevent leakage. An operating arm 24 is threaded on thc'outer end of valve stem 22 and is adjustably secured thereon by means of a lock nut 25. 1 Arm 24 is provided with a slot 24; and an operating lever '26 is secured centrally to shaft 12 and is pro vided with a smaller slot 27 cotipcrating with the slot Bl. A sleeve is fitted within slot 24"- aud abuts against the outer face of lever 26, said sleeve being secured in position by means of a bolt 29 passing therethrough and snugly fittiugslot 27 in lever 26, said parts being adjustably.secured in position by means of a nut 30 threaded on the inner end of bolt 29. By this arrangement, it will be observed, that sleeve 28 may be adj'ustably locked in position on lever 26 and slide in slot 24, thus constituting an operative connection between lever 26 and arm 24 for controlling the needle valve 22 and consequently the passage of fuel to pipe '19. By means of the lock nut 25 the posi- Patented May 12, 1914. l

' 'tion of arm 24 may be adjusted on needle l at right angles to each other on OPPOSltB closed positions,

valve 22', and by means of bolt 29 and nut 30 the operative relation between lever 26 and arm 24 may be varied, thusfurnishing means for quickly and delicately adjusting the amount of opening of needle valve 22 upon opening of throttle valve 11. This opening of needle valve 22 automatically furnishes the additional amount of fuel necessary for ,high speeds of the engine as will be readily understood.

Lever 26 carries two arms 31 and 32 formed integrally therewith and projecting sides of a stop lug 33 formed on the outer side of valve chamber 10. Arm 31 carries a set screw 34 adapted to contact with lug 33 when throttle valve 11 is open. By this arrangement it will be observed, that the throttlevalve 11- will be stopped at open or and that the closed position of said throttle valve may be adjusted as desired. This constitutes a simple and ellicient arrangement for the purpose,

While I have illustrated and described the preferred form of construction for carrying my invention into efiect,-this is capable of variation and modification without depart: ing from the spirit of the invention. 1, therefore, 'do not wish to be limited to the precise letails'of construction set forth, but

desire to avail myself of such'variations and'mod1fic'ations as come Within the scope of the appended'qlaims. v

Having described my, invention what I claim as new and'desire tosecure byLetters Patent is:

1. In a carbureter, a float chamber'having an opening in its bottom; a removable cover for said float chamber provided-with a tubula'r stem projecting above and below it and passing through the opening in the bottom of said float chamber; a nut threaded on said stem and abutting the bottom of said float chamber; a throttle valve chamber on said stem having an air valve seat therein; an air valve in said valve seat; a hollow stem depended from said valve and extendin through said tubular stem; anut threaded on the lower end of said hollow stem; and a spring around said hollow valve stem between said last mentioned nut and said lar stem, substantially as described.

2. In a carbureter, a float chamber an opening in its bottom; a removable cover for said float chamber provided with a tubular stem projecting above and below it and tubuhaving passing through the opening in the bottom of said float chamber; a nut threaded on said v stem and abutting the bottom of said float chamber; a throttle valve chamber on said stem having an air valve seat therein; an air valve in said valve seat;"a hollow stem depended from said valve and extending through said tubular stem; a nut threaded on the lower end of said hollow stem; aspring around said hollow valve stem between 'saidilast mentioned nut and said tubu" lar stem; and a U-shaped fuel supply tube having one leg portion connected with said float chamber and its other leg portion disposed concentrically in said hollow valve stem, the upper end of said other leg being open, substantially as described. o

In testimony whereof I have signed my name to this specification in the presence of twosubscribing witnesses.

FRANK a. SHARPNECK.

Witnesses:

JOSHUA R. H. Po'rrs, HELEN F. LiLLIs. 

